Ok this has to be a record, the version 6.1.3 has been exploited, and it just came out this week. It gets better... it's even easier now to go through the lock screen, compare to the older version and here's how:

"All you need is for voice dialing to be enabled and to pull out the SIM card mid-call. This brings up the dialer and from there you can access photos, call history, and more."